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    • 32. 发明授权
    • Optical pickup device and optical disc device
    • 光拾取装置和光盘装置
    • US08446809B2
    • 2013-05-21
    • US12763565
    • 2010-04-20
    • Kenji Nagatomi
    • Kenji Nagatomi
    • G11B7/00
    • G11B7/0909G11B2007/0013
    • An optical pickup device imparts different astigmatisms from each other to light fluxes in four light flux areas A through D formed around an optical axis of laser light, out of the laser light reflected on a disc. The optical pickup device also changes the propagating directions of the light fluxes in the light flux areas A through D to separate the light fluxes in the light flux areas A through D from each other. A signal light area where only signal light exists is defined on a detection surface of a photodetector. Sensing portions are arranged at a position corresponding to the signal light area. Accordingly, only the signal light is received by the sensing portions, thereby suppressing deterioration of a detection signal resulting from stray light.
    • 光拾取装置将不同的散光彼此分配给在光盘上反射的激光中形成在激光的光轴周围的四个光通量区域A至D中的光通量。 光拾取装置还改变光束区域A至D中的光束的传播方向,以将光通量区域A至D中的光束彼此分离。 仅在信号光存在的信号光区域被限定在光检测器的检测表面上。 感测部分布置在对应于信号光区域的位置处。 因此,只有信号光被感测部分接收,从而抑制由杂散光引起的检测信号的劣化。
    • 33. 发明授权
    • Optical pickup device
    • 光学拾取装置
    • US08358571B2
    • 2013-01-22
    • US13191794
    • 2011-07-27
    • Kenji NagatomiShinsei KasaharaShigeharu ShiraneMasayuki Yoshie
    • Kenji NagatomiShinsei KasaharaShigeharu ShiraneMasayuki Yoshie
    • G11B7/00
    • G11B7/131G11B7/1353G11B7/1374G11B7/1378G11B2007/0006G11B2007/0013
    • An optical pickup device has an astigmatism element which imparts astigmatism to reflected light of laser light reflected on a recording layer, and a spectral element into which the reflected light is entered, and which separates the reflected light. The spectral element is divided into four third areas by a first area having a certain width and formed along a straight line in parallel to a first direction, and by a second area having a certain width and formed along a straight line in parallel to a second direction. The spectral element is configured to guide the reflected light passing through the four third areas to respective corresponding sensors on a photodetector while making propagating directions of the reflected light different from each other, and to avoid guiding the reflected light entered into the first area and into the second area to the sensors.
    • 一种光学拾取装置具有散光元件,其对记录层上反射的激光的反射光和向反射光入射的光谱元件赋予散光,并分离反射光。 光谱元件被具有一定宽度的第一区域分成四个第三区域,并且沿着与第一方向平行的直线形成,并且具有一定宽度的第二区域,并且沿着与第二区域平行的直线形成 方向。 光谱元件被配置为在使反射光的传播方向彼此不同的同时将通过四个第三区域的反射光引导到光电检测器上的各个对应的传感器,并且避免引导入射到第一区域中的反射光并进入 传感器的第二个区域。
    • 34. 发明授权
    • Optical pickup device
    • 光学拾取装置
    • US08270280B2
    • 2012-09-18
    • US12890777
    • 2010-09-27
    • Kenji NagatomiSeiichiro Takahashi
    • Kenji NagatomiSeiichiro Takahashi
    • G11B7/135
    • G11B7/1353G11B7/0909G11B7/1275G11B7/131G11B7/133G11B7/1378
    • An optical pickup device is provided with a spectral element which imparts diffraction in such a manner that four light fluxes of the first laser light are separated from each other, when a light flux of the first laser light and a light flux of the second laser light reflected on a recording medium having laminated recording layers and servo layers are divided into four by a first straight line in parallel to a converging direction by an astigmatism element, and a second straight line perpendicular to the first straight line, and that the four light fluxes of the first laser light propagate on an outer side than the light flux of the second laser light; and a photodetector including a first sensor group which receives the first laser light, and a second sensor group which receives the second laser light.
    • 光拾取装置具有光谱元件,该光谱元件以第一激光的四个光束彼此分离的方式赋予衍射,当第一激光的光束和第二激光的光束 在具有层叠记录层和伺服层的记录介质上反射的第一直线与通过像散元件的会聚方向平行的第一直线和垂直于第一直线的第二直线分成四个,并且四个光束 所述第一激光在比所述第二激光的光束的外侧传播; 以及光电检测器,其包括接收第一激光的第一传感器组和接收第二激光的第二传感器组。
    • 36. 发明申请
    • OPTICAL PICKUP DEVICE
    • 光学拾取器件
    • US20120106312A1
    • 2012-05-03
    • US13284462
    • 2011-10-28
    • Kenji Nagatomi
    • Kenji Nagatomi
    • G11B7/1374
    • G11B7/131G11B7/1356G11B7/1374G11B7/1395G11B2007/0006G11B2007/0013
    • A first laser light source emits first laser light of a predetermined wavelength, and a second laser light source emits second laser light of a wavelength different from the wavelength of the first laser light. Reflected light of the first and second laser light is entered into an astigmatism portion. The astigmatism portion generates first and second focal lines. A light separating portion separates light fluxes of the reflected light of the first and second laser light from each other, the light fluxes obtained by dividing the reflected light of the first and second laser light into four light fluxes. The light separating portion is constituted of at least one prism having plural slopes, and the photodetector is provided with a common sensor portion which receives the light fluxes of the reflected light of the first and second laser light.
    • 第一激光源发射预定波长的第一激光,第二激光光源发射与第一激光的波长不同的波长的第二激光。 将第一和第二激光的反射光输入散光部分。 像散部分产生第一和第二焦线。 光分离部分将第一和第二激光的反射光的光束彼此分离,将通过将第一和第二激光的反射光分成四个光束而获得的光束。 光分离部由具有多个斜面的至少一个棱镜构成,并且光电检测器设置有接收第一和第二激光的反射光的光束的公共传感器部。
    • 37. 发明授权
    • Optical pickup device
    • 光学拾取装置
    • US08102748B2
    • 2012-01-24
    • US12715903
    • 2010-03-02
    • Kenji Nagatomi
    • Kenji Nagatomi
    • G11B7/00
    • G11B7/1376G11B7/1374G11B2007/0013G11B2007/13727
    • An optical pickup device radiates laser light to a disc having a plurality of recording layers in a direction of lamination. The optical pickup device includes a laser light source, a collimator lens, and an objective lens. The collimator lens changes a spread angle of the laser light emitted from the laser light source. The objective lens converges the laser light having passed through the collimator lens onto the disc. With the laser light in a parallel state having passed through the collimator lens, if a distance f between the laser light source and the collimator lens and a distance L between the collimator lens and the objective lens are in a relation of f
    • 光学拾取装置将激光照射到具有层叠方向的多个记录层的盘上。 光学拾取装置包括激光光源,准直透镜和物镜。 准直透镜改变从激光光源发射的激光的扩展角。 物镜会聚经过准直透镜的激光到光盘上。 在激光通过准直透镜的平行状态下,如果激光光源与准直透镜之间的距离f与准直透镜与物镜之间的距离L为f
    • 38. 发明申请
    • OPTICAL PICKUP DEVICE, OPTICAL DISC DEVICE AND FOCUS ADJUSTING METHOD
    • 光学拾取装置,光盘装置和聚焦调整方法
    • US20110026382A1
    • 2011-02-03
    • US12844245
    • 2010-07-27
    • Satoshi KanaiKenji Nagatomi
    • Satoshi KanaiKenji Nagatomi
    • G11B20/10G11B7/00
    • G11B20/10203G11B2220/2537
    • An optical pickup device includes an astigmatism element which imparts astigmatism to laser light reflected on a disc, a spectral element which changes propagating directions of four light fluxes obtained by dividing a light flux of the laser light reflected on the disc to disperse the four light fluxes from each other, and a photodetector having a sensor group which receives the four light fluxes. The optical pickup device is further provided with a memory which holds a correction value for suppressing a DC component in a tracking error signal resulting from a positional displacement of the spectral element. The tracking error signal is corrected by the correction value to thereby suppress the DC component.
    • 一种光学拾取装置包括散光对在盘上反射的激光进行散光的散光元件,通过将在光盘上反射的激光的光束分割而将四个光束的传播方向改变以分散四个光束的光谱元件 和具有接收四个光束的传感器组的光电检测器。 光拾取装置还具有保存用于抑制由于光谱元件的位置偏移而产生的跟踪误差信号中的直流分量的校正值的存储器。 通过校正值校正跟踪误差信号,从而抑制DC分量。